<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        p{
            font-size: 60px;
            class:red
        }
        #p1{
            font-style: italic;
        }
        .div1{
            border:1px solid red
        }
        .a{
            color:aliceblue
        }
        #ul li.li2{
            list-style: none;
        }
    </style>
</head>
<body>
    <p id="p1">我是一段文字</p>
    <p id="p2">我是另一段的文字</p>
    <div class="div1 a">我是div</div>
    <div class="div1 b">我是div</div>
    <div class="div1 a">我是div</div>
    <div class="div1 b">我是div</div>
    <ul id="ul">
        <li>1</li>
        <li class="li2">2</li>
        <li>3</li>
        <li>4</li>
    </ul>
</body>
</html>